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It is good to hear that the IOP is devoting time and energy into developing the route for corporate membership. However, I felt uneasy as I read the description of the new professional development scheme in the January issue (p49).

Genuine physicists—that is to say, physicists who make observations and experiments as well as theories —have always felt uneasy about 'relativity'. As Bridgman said, "if anything physical comes out of mathematics it must have been put in in another form". The problem was, he said, to find out where the physics got into the theory (Bridgman 1927).